Flint Company, I need help with the attached, thanks

Flint Company sells one product. Presented below is information for January for Flint Company. Jan. 1 4 11 13 20 27 Inventory Sale Purchase Sale Purchase Sale 118 93 165 136 163 104 units units units units units units at at at at at at $5 each $8 each $6 each $9 each $7 each $11 each Flint uses the FIFO cost flow assumption. All purchases and sales are on account. Compute gross profit using the periodic system